If you are going for a raised wall then it is well worth the extra and building the full depth wall and concrete lining the pond. Its not that much more than a liner and the effect is neater, more effective and longer lasting. Dont forget your bottom drain of course, that is key to successful filtration and allows easy lowering of the level. Bet is quite right about filters, at the end of the day they are just there to hold filter media, so no need to buy the brand names when a loft tank does the same job. Depending on the stocking level think about the oxygen level, I made the mistake of thinking I could get away without a powerful air pump and I couldnt. I have had 2 substantial koi ponds and not without going through the pain, its very hard to get it right first time.
In terms of fish the advice from Bet is excellent, do not rush to stock it, however tempting it may be! Beware of cheap fish and stick to one reputable supplier. Good luck and enjoy!
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